CMake: Populate list of required include directories for library targets

PUBLIC items will populate the INTERFACE_INCLUDE_DIRECTORIES property of
<target>. This property is a list of public include directories
requirements for a library.

Targets may populate this property to publish the include directories
required to compile against the headers for the target.

example/CMakeLists.txt

@@ -13,9 +13,7 @@ file(GLOB_RECURSE GAME_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
 
 add_executable(${GAME} ${GAME_SOURCES})
 target_include_directories(${GAME} PRIVATE
-	"src"
-	"${CMAKE_SOURCE_DIR}/src"
-	"${CMAKE_SOURCE_DIR}/vendor/ruc/src")
+	"src")
 target_link_libraries(${GAME} ${ENGINE})
 
 target_precompile_headers(${GAME} REUSE_FROM ${ENGINE})
@@ -25,5 +23,5 @@ target_precompile_headers(${GAME} REUSE_FROM ${ENGINE})
 # Add 'make run' target
 add_custom_target(run
     COMMAND ${GAME}
-	WORKING_DIRECTORY ".."
-)
+	WORKING_DIRECTORY "..")
+add_dependencies(run ${ENGINE})